s390/smp: make absolute lowcore / cpu restart parameter accesses more robust

[deliverable/linux.git] / arch / s390 / include / asm / processor.h

diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 20d0585cf905675422ad406d406401eba2bd6f82..f1700c5c88847965fe953ae81267f95f15b6214c 100644 (file)
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -348,4 +348,14 @@ extern void (*s390_base_ext_handler_fn)(void);
        ".previous\n"
 #endif
 
+extern int memcpy_real(void *, void *, size_t);
+extern void memcpy_absolute(void *, void *, size_t);
+
+#define mem_assign_absolute(dest, val) {                       \
+       __typeof__(dest) __tmp = (val);                         \
+                                                               \
+       BUILD_BUG_ON(sizeof(__tmp) != sizeof(val));             \
+       memcpy_absolute(&(dest), &__tmp, sizeof(__tmp));        \
+}
+
 #endif                                 /* __ASM_S390_PROCESSOR_H           */